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Yep I got it from a trainer. At least in R/S/E...now the Rus is in the freeze box or already in the 4th generation.
My first pokerus appeared in G/S and I was really shocked as the nurse told me of little animals crawling on my Poki...

There'll be total devastation,
Pure annihilation
Or absolute surrender.
I'll have limitless power,
This is our finest hour
Now go,go,go,go!

I got mine the day i started diamond. I got it from a wild geodude as i was about to talk to a girl in oreburogh mine. then she said that there was actually pokemon that were shaped like rocks, and if i could belive it. coincidence, no?

Pokerus can spread to other Pokemon if you put the infected Pokemon in your team, adjacent to other Pokemon. It'll eventually spread to them while you're battling. AlLso, Pokerus doesn't spread in the PC.